A. The word is emissary. (em-uh-ser-ee)
-Blair S.

B.
I was an emmisary for the U.S. when i visited Japan.
-Nick T.

D.
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-Dan W.

E. synonyms:

abettor, actor, advocate, ambassador, assignee, assistant, attorney, broker, commissioner, delegate, deputy, doer, emissary, envoy, executor, factor, factotum, functionary, go-between, handler, intermediary, lawyer, mediary, middleman, minister, mover, negotiator, officer, operative, operator, proctor, promoter, proxy, representative, salesman, servant, steward, substitute, surrogate, worker
These words are synonyms because they are different words but have the same meaning as emissary.

antonyms:principal
These words are antonyms because they have the opposite meanin of emissary.
(http://thesaurus.reference.com/browse/emissary)
-Jennifer Y

F. I once had an emissary come to our school to talk to us. She was from an organization that represented all women and she was an advocate for women's rights. she was an emissary becasue she represented a certain group for a specific cause.
- Amber Z.